foo.cc: In function 'int main()':
foo.cc:17:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   17 |  scanf("%d%d%d%d", &n, &m, &v, &e);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:18:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   18 |  for(int i=1;i<=n;i++)scanf("%d", c+i);
      |                       ~~~~~^~~~~~~~~~~
foo.cc:19:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   19 |  for(int i=1;i<=n;i++)scanf("%d", d+i);
      |                       ~~~~~^~~~~~~~~~~
foo.cc:20:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   20 |  for(int i=1;i<=n;i++)scanf("%lf", p+i);
      |                       ~~~~~^~~~~~~~~~~~
foo.cc:27:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   27 |   scanf("%d%d%d", &x, &y, &z);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~

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